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Detached-eddy simulation based on unstructured and hybrid grid
Received date: 2014-10-10
Revised date: 2014-12-10
Online published: 2015-01-30
Supported by
National Natural Science Foundation of China (91016001, 11272339)
To improve the turbulence simulation ability of the second order finite-volume algorithm based on unstructured and hybrid grid, a hybrid second order scheme is established by modifying the dissipation term of the standard Roe flux-difference splitting scheme and the numerical dissipation of the scheme can be self-adapted according to the detached-eddy simulation (DES) flow field information. The credibility of the approach is supported by two typical numerical examples of its application: Re=3 900 circular cylinder and NACA 0021 airfoil at high angle of attack (60°), and the DES predictions are compared with experimental data and with other numerical solutions. The DES methods based on both the one equation Spalart-Allmaras turbulence model and the two equation k-ω shear stress transport (SST) model are used in the computation. The effects of numerical schemes and turbulence models are also discussed in the study, which shows that the scale of turbulence structure resolved by the hybrid scheme is smaller than that resolved by the standard Roe scheme and the corresponding flow field is better; meanwhile the DES methods used in this paper are little affected by their RANS-based models.
ZHANG Yang , ZHANG Laiping , HE Xin , DENG Xiaogang . Detached-eddy simulation based on unstructured and hybrid grid[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2015 , 36(9) : 2900 -2910 . DOI: 10.7527/S1000-6893.2014.0342
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